He married into a world of car-ports and clap-board houses that for so many immigrants embodies the American dream, and yet even as he did so, Tamerlan Tsarnaev was apparently preparing to destroy what he had once heralded as a great gift.

Until the terrible events unfolded in Boston this week, for the Russell family of Rhode Island, the 26-year-old suspected Boston bomber was not a terrorist but the man who married their young daughter Katherine, then 21, converted her to Islam and fathered her a child.

Like all of America, the family struggled on Saturday to make sense of how – as Barack Obama put it when he addressed the nation – two young men who grew up and studied in America, "as part of our communities and our country", could resort to such violence?

19.05 (14.05) FBI confirm that it was Russia who asked the FBI to investigate Tamerlan Tsarnaev in 2011. Here is our full story:

As the hunt for the bombers culminated in a dramatic shootout, it emerged that Tamerlan Tsarnaev had been interviewed by US officials in 2011 because the Russian government was concerned over his ties to "radical Islam".

There were fears that Tamerlan, who was killed while trying to flee police on Friday evening, was ready to travel to the Caucasus to join "underground groups". However, the 26-year-old was released after the FBI assessed he had no connection to terrorist activity.

Red Sox's Ortiz addresses fans during a pre-game ceremony honoring the victims of the Boston Marathon bombings, before the team's MLB American League baseball game against the Royals

18.45Thermal imaging was key to police operation, the New York Daily News reports:

All David Henneberry and his wife Beth wanted to do was stretch their legs.They had been cooped up under a police lockdown for about 12 hours and now they looked forward to a breath of fresh air before nightfall.

But as Mr Henneberry, 66, strolled through the back garden of his house in Franklin Street, in the Boston suburb of Watertown, he realised something was amiss. The tarpaulin covering his boat was flapping in the wind and the cord that had held it in place had been severed.

“He got closer and realised that one of the retention straps had literally been cut,” explained Robert Duffy, Mr Henneberry’s stepson. Mr Henneberry decided to investigate.

“He put his ladder up on the side of the boat and climbed up,” said George Pizzuto, a neighbour. “And then he saw blood on it, and he thought he saw what was a body lying in the boat. So he got out of the boat fast and called police.”

Tamerlan Tsarnaev when he won the 2010 New England Golden Gloves Championship in Lowell

18.10 (13.10) More detail on the FBI being alerted to Tamerlan Tsarnaev in early 2011. According to the FBI, an unnamed foreign government said that based on its information, Tsarnaev was a strong believer and that he had changed drastically since 2010 as he prepared to leave the US for travel to a region in the country to join unspecified underground groups.

The FBI says it interviewed Tsarnaev and relatives, and did not find any domestic or foreign terrorism activity.

18.00 (13.00) Good new detail has come from Watertown police chief, Edward Devau. He confirmed that Dzhokhar Tsarnaev drove over his brother Tamerlan Tsarnaev to escape the gun battle with police, dragging him down the street.

Devau said two off-duty police were helping four officers who confronted the brothers in the overnight shootout.

"We estimate that over 200 shots were fired over a five-to-10 minute period," Devau told CNN, adding that the brothers also hurled a pressure cooker bomb and other homemade explosives.

"We found a pressure cooker embedded in a car down the street" after it caused "a major explosion during this gunfight," Devau said.

Two homemade grenades exploded and two others failed to go off. Another device was found in an abandoned car, he said.

Devau told how Tamerlan Tsarnaev suddenly emerged "and just starts walking down the street shooting at our police officers trying to get closer".

When the suspected bomber ran out of ammunition, two or three police overpowered him and were trying to handcuff him when the other brother drove the carjacked black Mercedes at them, said the police chief.

"One of them yells 'look out," said Devau. "They dive out of the way and he runs over his brother and drags him a short distance down the street."

Doctors officially pronounced Tamerlan Tsarnaev dead at the hospital, where his brother is now being treated.

Krystle Campbell, 29, was killed. Her parents were told she was alive in hospital

17.55 (12.55) William Campbell, the brother of victim Krystle Campbell, one of the three killed in bombing, telss the Boston Globe he was happy about the arrest, but that it was "not going to bring her back":

I’m happy that nobody else is going to get hurt by these guys, but it’s not going to bring her back.

'Our home whites are a little different today. We are so proud to play for our city'

17.23 (12.23) The Boston Red Sox will wear white jerseys as a tribute this afternoon. While the baseball team usually plays in white at home, the shirts will have "Boston" written in red lettering across the front rather than "Red Sox". The players will also sign the shirst and auction them off for The One Fund Boston:

&lt;noframe&gt;Twitter: Boston Red Sox - The special Boston home white jerseys worn today will be auctioned off to benefit The One Fund Boston. &lt;a href="http://search.twitter.com/search?q=BostonStrong" target="_blank"&gt;#BostonStrong&lt;/a&gt;&lt;/noframe&gt;

17.14 (12.14) Tamerlan Tsarnaev was kicked out of his uncle's house in Russia during a lengthy visit in 2012 because of his increasingly extremist views, a family member has told ABC News.

The relative, who insisted on remaining anonymous, apparently claimed that Tsarnaev had become radicalised during the trip to Russia.

16.55 (11.55) Watertown police tell CNN that early indications are that the Boston bombers acted alone.

16.11 (11.11) US. officials said a special interrogation team for high-value suspects was waiting to question Dzhokhar Tsarnaev, the Associated Press reported.

The team planned to question the 19-year-old without reading him his Miranda rights - the statement read by police to suspects stating their right to remain silent and have a lawyer.

Authorities were invoking a rare public safety exception triggered by the need to protect police and the public from immediate danger.

An FBI officer stands in front of the boat at 67 Franklin St. where Dzhokhar Tsarnaev, suspect in Boston Marathon bombings, was hiding inside in Watertown

This is how Hell Week comes to an end in America – with celebrations on the streets of Boston.

Monday's bombing at the finish line of the Boston Marathon on Patriots' Day propelled America back to a 9/11 mindset. Tuesday through Thursday were pre-occupied with grief, manhunts and memorial services. Poisonous envelopes mailed to the president and two US senators, along with a massive explosion at a fertilizer plant in Texas, only added to the low hum of anxiety.

I have never loved this city and its people more than I do today. Nothing can defeat the heart of this city.

14.24 (09.24) The mother of the two Boston bombers has said that Tamerlan Tsarnaev, 26, had been "controlled" by the FBI for at least three years.

Zubeidat Tsarnaeva told the English-language Russia Today television station in a phone interview, a recording of which was obtained by Reuters, that she believed her sons were innocent and had been framed:

He (Tamerlan) was controlled by the FBI, like, for three to five years.

They knew what my son was doing, they knew what sites on the Internet he was going to.

It is really, really a hard thing to hear. And being a mother, what I can say is that I am really sure, I am 100 percent sure, that this is a set-up.

Police officers smile as they leave the scene after the arrest of a suspect of the Boston Marathon bombings in Watertown

13.54 (08.54) Deanna Finn, who lives near where the suspect was captured, describes her terror as she hid in the bathroom listening to an exchange of gunfire outside, covering her son to keep him safe:

13.30 (08.30) On the discussion over what comes next for Dzhokhar Tsarnaev, Benjamin Wittes, senior fellow and research director in public law at the Brookings Institution, writes:

The current administration has a firm and publicly stated policy against using military detention for domestic captures or US citizens. So whatever the (National Defense Authorization Act) may theoretically authorise or tolerate, it doesn't affect this situation

13.20 (08.20) Reports that Jeff Bauman, the man who was pictured being helped having had his legs blown off:

&lt;noframe&gt;Twitter: Karyn Regal - The man who lost both his legs in the Boston bombing, and helped ID the suspects, has no insurance. There's a fund: &lt;a href="http://t.co/abFIiLxd0c" target="_blank"&gt;http://t.co/abFIiLxd0c&lt;/a&gt;&lt;/noframe&gt;

Crowds gather at Boston Marathon finish line on Boylston Street to honor victims of the bombings

12.26 (07.26) A fuller picture of both brothers is taking shape as more friends and people who knew them come forward to speak.

Friends and acquaintances of Dzhokhar Tsarnaev say he laughed at everyone's jokes. He tried hard to get along with everybody. He used the word "dude." He liked hip hop. He was cheery, nervous and socially awkward - but not in a way that made people uncomfortable. And he did not talk about politics much.

Nate Mann, 20, who was in the class above the younger Tsarnaev at Cambridge Rindge & Latin School, said:

Seriously, he was so, so normal, no accent, an all-American kid in every measurable sense of the word.

Tamerlan Tsarnaev, who was known as Timmy, appeared to be less social.

"I don't have a single American friend," Tamerlan was quoted as saying in a 2010 profile in "The Comment" magazine, published by Boston University's School of Communications. "I don't understand them."

Luis Vasquez, a 25-year-old youth counselor who went to school with Tsarnaev and lives two blocks away from the Tsarnaev house, remembers him differently:

He was just a big friendly giant. He had a sense of humour.

12.10 (07.10) Reports that investigation continuing around spot where Dzhokhar Tsarnaev was found:

Katherine Russell is believed to have married and had a daughter with Tamerlan Tsarnaev three years ago, having become a Muslim following her freshman year at Suffolk University in Boston.

Ms Russell, 24, was escorted by investigators to her parents' house in Rhode Island on Friday night, where she covered her face and refused to talk about her husband, who was shot dead by police.

Neighbours said they woke on Friday morning to find four FBI and police vehicles parked outside the house in North Kingston belonging to Ms Russell's parents Judith, 56, a nurse and Warren, 55, a doctor.

11.51 (06.51) A neighbour of the man, believed to be called David Henneberry, who discovered Dzhokhar Tsarnaev hiding in his boat in his garden, has been speaking to ABC News.

George Pizzuto said:

He looked and noticed something was off about his boat, so he got his ladder, and he put his ladder up on the side of the boat and climbed up, and then he saw blood on it, and he thought he saw what was a body laying in the boat.

So he got out of the boat fast and called police.

That boat's his baby. He takes care of it like you wouldn't believe. And they told him it's all shot up.

Police at the scene of the shoot-out which killed Tamerlan Tsarnaev, one of the Boston bombing suspects in Watertown (Matt Rourke/AP)

11.41 (06.41) Tamerlan Tsarnaev's mother-in-law has said her family is sickened by the horror inflicted by the deadly attack.

Judith Russell, whose daughter Katherine was married to Tsarnaev read a statement from inside her home in Rhode Island through a partially open doorway. A statement was also issued:

11.37 (06.37) Amid all the celebrations at the arrest of Dzhokhar Tsarnaev and the end of an emotional week for Boston, police urge people to remember the victims:

11.33 (06.33) Here is Obama on the successful operation to capture the bomber:

11.22 (06.22) Dzhokhar Tsarnaev went to a party with college friends two days after launching the deadly bomb attack, according to theBoston Globe.

A University of Massachusetts student said:

He was just relaxed.

11.15 (06.15) Bleeding and in serious condition, Dzhokar Tsarnaev, was admitted to a Boston hospital, a Massachusetts State Police spokesman said.

A spokeswoman for Beth Israel Deaconess Medical Center in Boston, Kelly Lawman, confirmed this morning that Tsarnaev was being treated there, but declined comment on his condition. The FBI would be providing any updates, she said.

Two bombs explode near the finish line of the Boston marathon, killing three and wounding nearly 180. US President Barack Obama says he did not know who was behind the attacks and ordered his administration to do whatever was necessary.

10.47 (05.47) Here are some US newspaper front pages celebrating the dramatic capture:

The Boston Globe and The Washington Post newspaper front pages for Saturday 20 April 2013

The New York Times and Los Angeles Times newspaper front pages for Saturday 20 April 2013

10.40 (05.40) Mobile phone footage captured by residents of Watertown show the raid on Boston marathon bomber Dzhokhar Tsarnaev, as he was cornered hiding in a boat parked in a backyard:

10.26 (05.26) Commentators in America are already debating how the bomber should be treated, with some - such asHowie Carr from the Boston Herald- stating that the death penalty is "the only justice" for Dzhokhar Tsarnaev:

Wouldn’t it be easier just to ... put him down, whoever he is, like the rabid dog that he so palpably is?

There is no death penalty in Massachusetts. However, some have called for Dzhokhar Tsarnaev to be stripped of his newly-acquired US citizenship and be tried as an "enemy combatant" - whereby be could, in theory, face the death penalty.

Lindsey Graham, the Republican South Carolina senator, tweeted:

&lt;noframe&gt;Twitter: Lindsey Graham - Under the Law of War we can hold &lt;a href="http://search.twitter.com/search?q=Boston" target="_blank"&gt;#Boston&lt;/a&gt; suspect as a potential enemy combatant not entitled to Miranda warnings or appointment of counsel.&lt;/noframe&gt;

10.15 (05.15) Russia and the United States have agreed to increase cooperation in the fight against terrorism in the attack by two ethnic Chechens on the Boston marathon.

The Kremlin said President Vladimir Putin called President Barack Obama to once again express his condolences and discuss ways the two sides can work more closely on security in the runup to the 2014 Winter Olympic Games in Sochi.

A statement from the Kremlin said:

Both sides underscored their interest in bolstering the close cooperation of Russian and US special services in the fight against international terrorism.

The White House also issued a statement saying that Obama thanked Putin for the condolences "and praised the close cooperation that the United States has received from Russia on counter-terrorism, including in the wake of the Boston attack".

The two leaders agreed to continue our cooperation on counter-terrorism and security issues going forward.

Youtube video of Tamerlan Tsarnaev shown by CNN

10.00 (05.00) The FBI reportedly interviewed the older Boston bomber in 2011 at the request of a foreign government.

Tamerlan Tsarnaev, who was shot and died soon afterwards after the first shoot-out in the early hours of Friday morning, was interviewed by federal officers according to reports by the Associated Press, Reuters and CNN.

One official told AP that the FBI shared its information with the foreign government. The official did not say what country made the request about Tamerlan Tsarnaev or why.

09.53 (04.53) Here are some more tweets from an Twitter account - @J_tsar - said to belong to Dzhokhar Tsarnaev - including one he appears to have sent after the bomb attack in which he warned the people of Boston to "stay safe":

&lt;noframe&gt;Twitter: Jahar - Ain't no love in the heart of the city, stay safe people&lt;/noframe&gt;

&lt;noframe&gt;Twitter: Jahar - Nowadays everybody wanna talk like they got somethin to say but nothin comes out when they move their lips; just a bunch of gibberish&lt;/noframe&gt;

09.44 (04.44) Interpol has announced that US authorities have asked it to provide any information its members around the world might have on bombs similar to the ones used in the Boston marathon attack. Interpol issued an alert for photos of the bombs and fingerprints of the two suspects in the case.

A statement said:

Interpol has issued an international security alert, or Orange Notice, detailing the features of the improvised explosive devices used in the Boston marathon bombings to assist law enforcement across its 190 member countries detect any similarly configured bombs.

09.33 (04.33) Boston police announced the capture of Dzhokhar Tsarnaev on twitter:

&lt;noframe&gt;Twitter: Boston Police Dept. - CAPTURED!!! The hunt is over. The search is done. The terror is over. And justice has won. Suspect in custody.&lt;/noframe&gt;

09.27 (04.27) After a day in which the entire greater Boston area was in lock-down, police honed in on a house in Watertown.

A man in the suburb saw blood on a boat parked in a yard and pulled back the tarpaulin to see a man covered in blood, authorities said. The resident called authorities and when police arrived, they tried to talk the suspect into getting out of the boat, said Boston Police Commissioner Ed Davis.

"He was not communicative," Davis said.

Instead, he said, there was an exchange of gunfire. An FBI SWAT team eventually overpowered the gunman with a series of stun grenades and was able to apprehend him alive.

It was the final volley of one of the biggest manhunts in American history. Dzhokhar Tsarnaev was taken away in an ambulance:

Dzhokhar Tsarnaev visible through an ambulance after he was captured in Watertown on Friday 19 April 2013

09.15 (04.15) President barack Obama has praised Boston's law enforcement after the operation to capture the two bombers, but noted that questions remained about how they were able to execute such a devastating attack on the city:

Obviously there are still many unanswered questions. Among them: why did young men who grew up and studied here... resort to such violence.

When a tragedy like this happens, with public safety at risk and the stakes so high, it's important that we do this right. That's why we take care not to rush to judgment - not about the motivations of these individuals, certainly not about entire groups of people.

09.05 (04.05) Residents of Boston area take to the streets to celebrate the capture of the marathon bombing suspect:

09.02 (04.02) To recap, police captured the surviving Boston marathon bombing suspect, found bloodied in a backyard boat just after midnight London time - 7pm on the East Coast. Dzhokhar Tsarnaev was taken alive, though seriously wounded. His brother and fellow suspect in Monday's Boston Marathon bomb attack was shot dead overnight Thursday to Friday after a gun battle with police.

Dzhokhar Tsarnaev, the Boston bombing suspect being treated after his arrest

09.00 GMT (04.00 ET) Good morning and welcome to live coverage as Boston celebrates the capture of the second arathon bomber.